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. 2020 Nov;70(2):380-387.
doi: 10.1007/s12020-020-02402-5. Epub 2020 Jul 3.

Cyclin A in nonfunctioning pituitary adenomas

Elisa B Lamback  1 , Alexandro Guterres  2 , Monique Alvares Barbosa  3 , Carlos Henrique de Azeredo Lima  2 , Debora Aparecida Silva  2 , Aline Helen da Silva Camacho  2   4 , Leila Chimelli  2 , Leandro Kasuki  1   5   6 , Mônica R Gadelha  7   8   9
Affiliations

Cyclin A in nonfunctioning pituitary adenomas

Elisa B Lamback et al. Endocrine. 2020 Nov.

Abstract

Purpose: Assess cyclin A in nonfunctioning pituitary adenomas (NFPA) and compare its expression in non-invasive and non-proliferative tumors with invasive and proliferative tumors (12× higher risk of recurrence).

Methods: Quantitative real time polymerase chain reaction to analyze cyclin A using normal pituitary gland as reference. Fold change (FC) > 1 was considered as increased. Tumor invasion was based on Knosp criteria (grades 3-4 considered invasive) and proliferation on the presence of at least two of three criteria: Ki-67 ≥ 3%; mitoses > 2/10; positive p53. Both groups were compared with Mann-Whitney test considering p value < 0.05 as statistically significant.

Results: Thirty-one patients with NFPA were included. Tumors were mainly of gonadotrophic origin (74.2%), followed by corticotrophic (19.4%) and lactotrophic (3.2%) origins and null-cell adenomas (3.2%). Median tumor diameter was 3.5 cm (1.8-8.0) and Ki-67 was 3.0% (0.3-11%). Sixteen patients had tumors classified as non-invasive and non-proliferative and 15 as invasive and proliferative. Median FC was 0.31 in all tumors (0.13-1.94). Cyclin A was not related to invasion or proliferation (FC 0.41 in non-invasive and non-proliferative tumors and FC 0.30 in invasive and proliferative tumors; p = 0.968). Four (12.9%) patients had tumors that exhibited increased cyclin A [median FC of 1.04 (1.02-1.94)]-three of gonadotrophic origin and one null-cell adenoma, with two tumors classified as non-invasive and non-proliferative and two tumors classified as invasive and proliferative. Median tumor diameter in these samples was 3.4 cm (2.4-3.6) and Ki-67 was 5.1% (2-11%).

Conclusions: Cyclin A was increased in a minority of NFPA and does not seem to be related to invasion or proliferation.

Keywords: Cyclin A; Invasion; Nonfunctioning pituitary adenomas; Proliferation; Tumorigenesis.

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